Chart-topping songs are getting more depressing over time

Feeling down lately? It could be the music you’re listening to.

## 
## Call:
## lm(formula = valence ~ release_year, data = tracks_subset)
## 
## Residuals:
##      Min       1Q   Median       3Q      Max 
## -0.56939 -0.18935  0.04282  0.20834  0.42216 
## 
## Coefficients:
##                Estimate Std. Error t value Pr(>|t|)    
## (Intercept)   6.2769123  0.9542633   6.578 7.59e-11 ***
## release_year -0.0028486  0.0004807  -5.926 4.24e-09 ***
## ---
## Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
## 
## Residual standard error: 0.2451 on 1028 degrees of freedom
## Multiple R-squared:  0.03303,    Adjusted R-squared:  0.03209 
## F-statistic: 35.11 on 1 and 1028 DF,  p-value: 4.238e-09

Interactive Graph

Lowess Curve